I brought my truck to a shop 7 months ago ( the guys screwed me around to say the least) he finally gets to pulling the engine 2 weeks ago and now tells me the flywheel is broken first it was the cam shaft, which to me if the cams broke it would mess up the alignment of the pistons and sieze up the whole shebang (is that a proper assumption?) what the truck was doing was making a metal on metal grinding sound from hell, wish i would have recorded it, could it have been the flywheel that was causing the sound? i dont know how bad its broken as of yet but he said on the phone "its busted all to hell"

 

Yes that could have been the flywheel. My DMF (dual mass flywheel) broke a spring a few weeks ago. It made a pretty nasty metal on metal grinding sound.

 

lol broken cam? i think i would find someone else if it were me

 

can you post some pictures? i recently installed a lightweight flywheel on my mustang and am getitng a loud metal rubbing/rining sound from time to time and i believe its somewhere from that area..

 

Nothing on a mustang is going to look remotely close to large diesel engines in these trucks. The stock dual mass flywheel is close to 70 lbs, NOT lightweight...

I'd suggest finding a different forum to ask this question. But if you really want to, search for my thread from about a month ago titled something like horrible noise from clutch. I think I posted a few pictures of the broken spring.
Here's my two cents, if the noise started after putting the lightweight flywheel in, I'd say there is a problem with your install.